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,Moo, AMERICAN NATIONAL STANDARD F61.1-1981 rr � - f 6.2.5 Provisions shall be made to secure both 6.4 Piping and Fittings ends of the hose while in transit. 6.4.1 All piping, tubing and fittings shall be 6.2.6 When the cradle and the container are securely mounted and protected againstphysical not welded together, suitable material shall be damage. used between them to eliminate metal-to-metal 6.4.2 Piping used on non-refrigerated systems friction. shall be at least ASTM A-53 Grade B Electric 6.3 Container Appurtenances Resistance Welded and Electric Flash Welded Pipe or equal.Such pipe shall be at least Schedule 6.3.1 Non-recessed container fittings and 40 whenjoints are welded,or welded andflanged. appurtenances shall be protected againstphysical Such pipe shall be at least Schedule 80 when damage by either:(1)a protected location,(2)the joints are threaded.Brass,copper,or galvanized vehicle frame or bumper, or (3) a protective steel pipe or tubing shall not be used. housing. The protective housing, if used, shall 6.4.3 The truck unloading line shall be pro- comply with the requirements under which the vided with an excess flow valve at the hose containers are fabricated with respect to design connection unless an approved quick closing and construction, and shall be designed to with- internal valve is provided in the container stand static loadings in any direction equal to unloading connection.(See 6.3.2) twice the weight of the container and attach- ments when filled with the lading using a safety 6.5 Pressure Relief Devices factor of not less than 4, based on the ultimate strength of the material to be used.The protective 6.5.1 The discharge from container pressure housing if used shall be protected with a weather relief valves shall be vented away from the cover, if necessary,to insure proper operation of container upward and unobstructed to the open valves and pressure relief devices. air in such a manner as to prevent any impinge- ment of escaping gas upon the container; loose fitting rain caps shall be used. Size of discharge filling connections (see 6.3.3), pressure relief lines from pressure relief valves shall not be devices, and liquid level and pressure gage smaller than the nominal size of the pressure connections, shall be provided with suitable relief valve outlet connection.Suitable provision automatic excess flow valves, or in lieu thereof, shall be made for draining condensate which may be fitted with quick-closing internal valves, may accumulate in the discharge pipe. which shall remain closed except during delivery operations. The control mechanism for such 6.6 Placarding and Marking of Container valves may be provided with a secondary control remote from the delivery connections and such 6.6.1 Every container, whether loaded or control mechanism shall be provided with a empty,shall be conspicuously and legibly marked fusible section(melting point 208 F to 220 F)(98 on each side and each end thereof on a background C to 104 C)which will permit the internal valve to of sharply contrasting color with the words, close automatically in case of fire. "ANHYDROUS AMMONIA" in letters at least 6.3.3 Filling connections shall be provided two inches (50.8 mm) high and DOT "NON- FLAMMABLE GAS"placards. with automatic back-pressure check valves, excess-flow check valves, or quick-closing 6.7 Transfer of Liquids internal valves, to prevent back-flow in case the filling connection is broken. Where the filling 6.7.1 The content of tank motor vehicle con- and discharge connect to a common opening in tainers shall be determined by weight,by suitable the container shell and that openingisfitted with liquid level gaging devices, -meters, or other a quick-closing internal valve as specified in approved methods. 6.3.2, the automatic valve shall not be required. NOTE: If the content of a container is to be determined by 6.3.4 All containers shall be equipped for liquid level measurement, the container shall have a ther- mometer well so that the internal liquid temperature can easily determined. This volume when converted to weight an approved vapor return valve of adequate shall not exceed the filling density specified by the Depart- capacity. ment of Transportation Regulations. 6.3.5 All containers shall be equipped with a 6.7.2 Pumps or compressors shall be designed fixed maximum liquid level gage. and installed in accordance with paragraph 2.12 and protected against physical damage when �. 6.3.6 All containers shall be equipped with a mounted upon ammonia tank trucksand trailers. pressure-indicating gage havi ng a d ial graduated from 0-400 psig(0-2758 kPa). 6.7.3 Tank motor vehicles of greater than 3500 22